diff --git a/pkg/scalers/nats_jetstream_scaler_test.go b/pkg/scalers/nats_jetstream_scaler_test.go
index a30fa59f854..c73029f106f 100644
--- a/pkg/scalers/nats_jetstream_scaler_test.go
+++ b/pkg/scalers/nats_jetstream_scaler_test.go
@@ -222,9 +222,7 @@ var testNATSJetStreamMockResponses = []parseNATSJetStreamMockResponsesTestData{
 }
 
 var testNATSJetStreamServerMockResponses = map[string][]byte{
-	"not-leader-1.localhost:8222": []byte(`{"server_name": "not-leader-1", "cluster": {"urls": ["leader.localhost.nats.svc:8222", "not-leader-2.localhost.nats.svc:8222"]}}`),
-	"not-leader-2.localhost:8222": []byte(`{"server_name": "not-leader-2", "cluster": {"urls": ["leader.localhost.nats.svc:8222", "not-leader-1.localhost.nats.svc:8222"]}}`),
-	"leader.localhost:8222":       []byte(`{"server_name": "leader", "cluster": {"urls": ["not-leader-1.localhost.nats.svc:8222", "not-leader-2.localhost.nats.svc:8222"]}}`),
+	"localhost:8222": []byte(`{"server_name": "leader", "cluster": {"urls": ["leader.localhost.nats.svc:8222","not-leader-1.localhost.nats.svc:8222", "not-leader-2.localhost.nats.svc:8222"]}}`),
 }
 
 func TestNATSJetStreamIsActive(t *testing.T) {
@@ -234,8 +232,7 @@ func TestNATSJetStreamIsActive(t *testing.T) {
 			t.Fatal("Could not parse mock response struct:", err)
 		}
 
-		srv := natsMockHTTPJetStreamServer(t, mockResponseJSON)
-		defer srv.Close()
+		client, srv := natsMockHTTPJetStreamServer(t, mockResponseJSON)
 
 		ctx := context.Background()
 		meta, err := parseNATSJetStreamMetadata(&ScalerConfig{TriggerMetadata: mockResponse.metadata.metadataTestData.metadata, TriggerIndex: mockResponse.metadata.triggerIndex})
@@ -246,7 +243,7 @@ func TestNATSJetStreamIsActive(t *testing.T) {
 		mockJetStreamScaler := natsJetStreamScaler{
 			stream:     nil,
 			metadata:   meta,
-			httpClient: http.DefaultClient,
+			httpClient: client,
 			logger:     InitializeLogger(&ScalerConfig{TriggerMetadata: mockResponse.metadata.metadataTestData.metadata, TriggerIndex: mockResponse.metadata.triggerIndex}, "nats_jetstream_scaler"),
 		}
 
@@ -285,12 +282,7 @@ func TestNATSJetStreamGetMetrics(t *testing.T) {
 			t.Fatal("Could not parse mock response struct:", err)
 		}
 
-		tr := http.DefaultTransport.(*http.Transport).Clone()
-		srv := natsMockHTTPJetStreamServer(t, mockResponseJSON)
-		defer func() {
-			srv.Close()
-			http.DefaultTransport = tr
-		}()
+		client, srv := natsMockHTTPJetStreamServer(t, mockResponseJSON)
 
 		ctx := context.Background()
 		meta, err := parseNATSJetStreamMetadata(&ScalerConfig{TriggerMetadata: mockResponse.metadata.metadataTestData.metadata, TriggerIndex: mockResponse.metadata.triggerIndex})
@@ -301,7 +293,7 @@ func TestNATSJetStreamGetMetrics(t *testing.T) {
 		mockJetStreamScaler := natsJetStreamScaler{
 			stream:     nil,
 			metadata:   meta,
-			httpClient: http.DefaultClient,
+			httpClient: client,
 			logger:     InitializeLogger(&ScalerConfig{TriggerMetadata: mockResponse.metadata.metadataTestData.metadata, TriggerIndex: mockResponse.metadata.triggerIndex}, "nats_jetstream_scaler"),
 		}
 
@@ -316,14 +308,17 @@ func TestNATSJetStreamGetMetrics(t *testing.T) {
 	}
 }
 
-func natsMockHTTPJetStreamServer(t *testing.T, mockResponseJSON []byte) *httptest.Server {
+func natsMockHTTPJetStreamServer(t *testing.T, mockResponseJSON []byte) (*http.Client, *httptest.Server) {
 	dialer := &net.Dialer{
 		Timeout:   30 * time.Second,
 		KeepAlive: 30 * time.Second,
 	}
 
 	// redirect leader.localhost for the clustered test
-	http.DefaultTransport.(*http.Transport).DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+	client := &http.Client{
+		Transport: &http.Transport{},
+	}
+	client.Transport.(*http.Transport).DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
 		if strings.HasSuffix(addr, ".localhost:8222") {
 			addr = "127.0.0.1:8222"
 		}
@@ -367,16 +362,13 @@ func natsMockHTTPJetStreamServer(t *testing.T, mockResponseJSON []byte) *httptes
 	srv.Listener = l
 	srv.Start()
 
-	return srv
+	return client, srv
 }
 
 func TestNATSJetStreamgetNATSJetstreamMonitoringData(t *testing.T) {
-	tr := http.DefaultTransport.(*http.Transport).Clone()
-
-	invalidJSONServer := natsMockHTTPJetStreamServer(t, []byte(`{invalidJSON}`))
+	client, invalidJSONServer := natsMockHTTPJetStreamServer(t, []byte(`{invalidJSON}`))
 	defer func() {
 		invalidJSONServer.Close()
-		http.DefaultTransport = tr
 	}()
 
 	ctx := context.Background()
@@ -388,7 +380,7 @@ func TestNATSJetStreamgetNATSJetstreamMonitoringData(t *testing.T) {
 	mockJetStreamScaler := natsJetStreamScaler{
 		stream:     nil,
 		metadata:   meta,
-		httpClient: http.DefaultClient,
+		httpClient: client,
 		logger:     InitializeLogger(&ScalerConfig{TriggerMetadata: testNATSJetStreamGoodMetadata, TriggerIndex: 0}, "nats_jetstream_scaler"),
 	}
 
@@ -399,7 +391,7 @@ func TestNATSJetStreamgetNATSJetstreamMonitoringData(t *testing.T) {
 }
 
 func TestNATSJetStreamGetNATSJetstreamNodeURL(t *testing.T) {
-	invalidJSONServer := natsMockHTTPJetStreamServer(t, []byte(`{invalidJSON}`))
+	client, invalidJSONServer := natsMockHTTPJetStreamServer(t, []byte(`{invalidJSON}`))
 	defer invalidJSONServer.Close()
 
 	meta, err := parseNATSJetStreamMetadata(&ScalerConfig{TriggerMetadata: testNATSJetStreamGoodMetadata, TriggerIndex: 0})
@@ -410,7 +402,7 @@ func TestNATSJetStreamGetNATSJetstreamNodeURL(t *testing.T) {
 	mockJetStreamScaler := natsJetStreamScaler{
 		stream:     nil,
 		metadata:   meta,
-		httpClient: http.DefaultClient,
+		httpClient: client,
 		logger:     InitializeLogger(&ScalerConfig{TriggerMetadata: testNATSJetStreamGoodMetadata, TriggerIndex: 0}, "nats_jetstream_scaler"),
 	}
 
@@ -423,7 +415,7 @@ func TestNATSJetStreamGetNATSJetstreamNodeURL(t *testing.T) {
 }
 
 func TestNATSJetStreamGetNATSJetstreamServerURL(t *testing.T) {
-	invalidJSONServer := natsMockHTTPJetStreamServer(t, []byte(`{invalidJSON}`))
+	client, invalidJSONServer := natsMockHTTPJetStreamServer(t, []byte(`{invalidJSON}`))
 	defer invalidJSONServer.Close()
 
 	meta, err := parseNATSJetStreamMetadata(&ScalerConfig{TriggerMetadata: testNATSJetStreamGoodMetadata, TriggerIndex: 0})
@@ -434,7 +426,7 @@ func TestNATSJetStreamGetNATSJetstreamServerURL(t *testing.T) {
 	mockJetStreamScaler := natsJetStreamScaler{
 		stream:     nil,
 		metadata:   meta,
-		httpClient: http.DefaultClient,
+		httpClient: client,
 		logger:     InitializeLogger(&ScalerConfig{TriggerMetadata: testNATSJetStreamGoodMetadata, TriggerIndex: 0}, "nats_jetstream_scaler"),
 	}